-53.53% is the change from 170 to 79
Calculation steps:
[( 79 - 170 ) ÷ 170] x 100 = -53.53%
Formula
Percentage change = [(79 - 170) / 170] x 100
Subtract the new number by the original number
79 - 170 = -91
-91 ÷ 170 = -0.5352941176470588
-0.5352941176470588 x 100 = -53.53%